Improvement in copying-presses



parte che.

-J A.ME-s"M.,KEnP,' oF `New YORK, N. Y.

Letters Patent No. 93,536, dated August 10, 1869.

.IMPROVEMENT IN COPYING-PRESSES.

The Schedule "referxed to in these Letters P atent and making' part of the same. l

To all whom it may concern Be it known that. I, J AMES M. Knnigof the city of New York, in the State of New York, have invented a novel and improvedl Letter-Press, of which the following is a full, clear, and exact description, reference being had to the drawings accompanying these specifications, and forming a part oi' the same, and in which- Figure 1 represents a perspective view, and

Figure 2,I a longitudinalsection of my letter-press. My invention relates to 'improvements "in threewheeled letter-presses; and to this end,

It consists in the employment of lifting-stays secured to the platen, substantially as hereinafter described.

` It further consists in the employment yof stieners attached to each end of the platen, and also in surrounding the screws with metal casings, as and for the purpose hereinafter speciiied.

It consists of a base, A, platen B, threeftoothed wheels G L G, two screw-rods D D, three lifting-stays E E E, and hand-wheel or lever F,all combined and arranged as shown'in the drawings, and constructed and operating as follows: 1 A Two of the wheels C G being foimed of equal size and with an equal number of teeth, anda third or middle wheel of a size 'to suit the fancy, the teeth properly tting the wheels C C. Next, two screwrods or bolts D D, provided with strong heads, and

' of proper length and threaded, to which are fitted the two wheels O C, which serve as nuts or female-screws and revolve upon the screw-rods.

The third or middle wheel L lis provided with a stem, H, to whichis attached thev lever F. This wheel is seated in the platen Y, iig` 2, to keep it ,firmly in its place.

"he lifting-straps are simply piecesof metal with 'holes through lthe middle of two of them, large enough to admit the screw-rods, and the other to adlnitrthe stem, which is attached to the middle wheel. rlhey are perforated to admit of their being screwed down to the platen.

The base and platen being formed of proper size, all the parts are ready and may he put together by boring through the base and platen, so that the screwrods may be passed up through them, thereby connecting them together.

The two wheels G C are run down upon the rods;

the middle wheel L is placed in position between the. two screw-wheels; the lifting-stays are brought down over the wheels, extending across them, and are fastened down upon the platen at each end;.the handwheel or lever being fastened upon the' upper end ot the stem, the press is complete and ready for use, the operation of wh'ch is as follows:

By turning the hand-wheel or lever, motion is communicated to the two screw-wheels, which revolve around the screw-bolts, when, following the thread downward, they force downthe platen, By reversing the-motion, the platen is returned 'or carried upward by means'of ythe screw-Wheels coming in contact with the lifting-stays, the `stayimross the middle wheel serving. to keep it in its place.

-It will be observed that all of the wheels and the lever rise and fall simultaneously with the platen, to which they are attached by means of the stays.

The advantages of my invention over other letterpresses are, cheapness, strength, and convenience.

The press may be constructed partly of wood, there- Vby making it very light. I

The greatest strainis divided between two screws, is direct upon the bolts or rods, and upon opposite sides of the press, thereby bringing down the platen evenly upon the object to 'be pressed.

What I claim as my invention, and desire to secure by Letters Patent, is

1. Surrounding the screws D D with casings D D',

as and for the purpose'specied.

2. Providing the platen B with lifting-stays E E E, as and for the purpose set forth.

lVitn'esses: Geo. E. J nwn'rr, A. Trrswowrn.

J. M. KEEP. 

